Abstract
Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Recently, charge density wave (CDW) was found below the superconducting dome in YBa2Cu3Oy when a high magnetic field is applied perpendicular to the CuO2 plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. Here by 63Cu-nuclear magnetic resonance, we report the discovery of CDW induced by an in-plane field, setting in above the dome in single-layered Bi2Sr2−xLaxCuO6. The onset temperature TCDW takes over the antiferromagnetic order temperature TN beyond a critical doping level at which superconductivity starts to emerge, and scales with the pseudogap temperature T*. These results provide important insights into the relationship between spin order, CDW and the pseudogap, and their connections to high-temperature superconductivity.
Highlights
Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known
Scanning tunneling microscopy (STM) in Bi2Sr2CaCu2O8+δ′ found a modulation of local density of states (DOS) in the vortex cores where superconductivity is destroyed[7], which was interpreted as due to halos of incipient charge density wave (CDW) localized within the cores[8,9]
Resonant elastic and inelastic x-ray spectroscopy (RXS) measurements found a short-range CDW with ordering vectors along the in-plane Cu-O bond directions, q = (~0.3, 0) and (Q(0Yu,Bi~tCe0O.3)r)1e.0c,Te1n1htelyac,nodritrelwaξtaai;obs n~s2lue0gngÅgetshtefidosrξba;ytbh~e157O0oÅthnefuorcrleYsayBrsate2mCmausg31nO2–e71t−i6cy. resonance (NMR) in YBCO that such CDW is of static origin[17]
Summary
Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Charge density wave (CDW) was found below the superconducting dome in YBa2Cu3Oy when a high magnetic field is applied perpendicular to the CuO2 plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. RXS indicated that a high field induces a correlation along the CuO-chain direction and modifies the coupling between CuO2 bilayers, causes a three-dimensional CDW20,21 These observations are consistent with early discovery of a Fermi-surface reconstruction by quantum oscillations[22] and a recent report of a thermodynamic phase transition[23]. As the long-range CDW onsets below Tc(H = 0) and only emerges when the field is applied perpendicular to the CuO2 plane, a widespread speculation is that it is due to incipient CDW in the vortex cores[7] that becomes overlapped as the field gets stronger[11,13,24]. The role of the CuO chain is unclear; in Bi2Sr2CaCu2O8+δ without a CuO chain, no long-range CDW was found[25]
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